搜题请搜索小程序“爱下问搜题”
问题 选择题

下列有关声音的说法中，正确的说法是[ ]

A ．真空不能传声

B ．发声体振动频率越高，响度越大

C ．发声体的振幅越大，频率越高

D ．戴耳罩是在声源处减弱噪声

答案

答案：A

选择题

—We were not sure which way to go. In the end we chose to turn right.

—You _______ the wrong way. You _______ left.

A．had gone; must have turned

B．went; must have turned

C．had gone; should have turned

D．went; should have turned
查看答案
填空题

有12个羽毛球，平均分给5人，每人分______个，还剩______个．
查看答案